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TDengine
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docs(driver): jdbc 3.2.1 document and error code

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docs/en/14-reference/03-connector/04-java.mdx
浏览文件 @ 50a24667
......@@ -36,6 +36,104 @@ REST connection supports all platforms that can run Java.
Please refer to [version support list](/reference/connector#version-support)
## Recent update logs
| taos-jdbcdriver version | major changes |
| :---------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------: |
| 3.1.0 | JDBC REST connection supports schemaless/prepareStatement over WebSocket |
| 3.2.0 | This version has been deprecated |
| 3.1.0 | JDBC REST connection supports subscription over WebSocket |
| 3.0.1 - 3.0.4 | fix the resultSet data is parsed incorrectly sometimes. 3.0.1 is compiled on JDK 11, you are advised to use other version in the JDK 8 environment |
| 3.0.0 | Support for TDengine 3.0 |
| 2.0.42 | fix wasNull interface return value in WebSocket connection |
| 2.0.41 | fix decode method of username and password in REST connection |
| 2.0.39 - 2.0.40 | Add REST connection/request timeout parameters |
| 2.0.38 | JDBC REST connections add bulk pull function |
| 2.0.37 | Support json tags |
| 2.0.36 | Support schemaless writing |
**Note**: adding `batchfetch` to the REST connection and setting it to true will enable the WebSocket connection.
### Handling exceptions
After an error is reported, the error message and error code can be obtained through SQLException.
```java
try (Statement statement = connection.createStatement()) {
// executeQuery
ResultSet resultSet = statement.executeQuery(sql);
// print result
printResult(resultSet);
} catch (SQLException e) {
System.out.println("ERROR Message: " + e.getMessage());
System.out.println("ERROR Code: " + e.getErrorCode());
e.printStackTrace();
}
```
There are four types of error codes that the JDBC connector can report:
- Error code of the JDBC driver itself (error code between 0x2301 and 0x2350),
- Error code of the native connection method (error code between 0x2351 and 0x2360)
- Error code of the consumer method (error code between 0x2371 and 0x2380)
- Error code of other TDengine function modules.
For specific error codes, please refer to.
| Error Code | Description | Suggested Actions |
| ---------- | --------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| 0x2301 | connection already closed | The connection has been closed, check the connection status, or recreate the connection to execute the relevant instructions. |
| 0x2302 | this operation is NOT supported currently! | The current interface does not support the connection. You can use another connection mode. |
| 0x2303 | invalid variables | The parameter is invalid. Check the interface specification and adjust the parameter type and size. |
| 0x2304 | statement is closed | The statement is closed. Check whether the statement is closed and used again, or whether the connection is normal. |
| 0x2305 | resultSet is closed | result set The result set is released. Check whether the result set is released and used again. |
| 0x2306 | Batch is empty! | prepare statement Add parameters and then execute batch. |
| 0x2307 | Can not issue data manipulation statements with executeQuery() | The update operation should use execute update(), not execute query(). |
| 0x2308 | Can not issue SELECT via executeUpdate() | The query operation should use execute query(), not execute update(). |
| 0x2309 | invalid sql for executeQuery: (?) | - |
| 0x230a | Database not specified or available | - |
| 0x230b | invalid sql for executeUpdate: (?) | - |
| 0x230c | invalid sql for execute: (?) | - |
| 0x230d | parameter index out of range | The parameter is out of bounds. Check the proper range of the parameter. |
| 0x230e | connection already closed | The connection has been closed. Please check whether the connection is closed and used again, or whether the connection is normal. |
| 0x230f | unknown sql type in tdengine | Check the data type supported by TDengine. |
| 0x2310 | can't register JDBC-JNI driver | The native driver cannot be registered. Please check whether the url is correct. |
| 0x2311 | can't register JDBC-RESTful driver | - |
| 0x2312 | url is not set | Check whether the REST connection url is correct. |
| 0x2313 | invalid sql | - |
| 0x2314 | numeric value out of range | Check that the correct interface is used for the numeric types in the obtained result set. |
| 0x2315 | unknown taos type in tdengine | Whether the correct TDengine data type is specified when converting the TDengine data type to the JDBC data type. |
| 0x2316 | unknown timestamp precision | - |
| 0x2317 | | wrong request type was used in the REST connection. |
| 0x2318 | | data transmission exception occurred during the REST connection. Please check the network status and try again. |
| 0x2319 | user is required | The user name information is missing when creating the connection |
| 0x231a | password is required | Password information is missing when creating a connection |
| 0x231b | invalid json format | - |
| 0x231c | httpEntity is null, sql: | Execution exception occurred during the REST connection |
| 0x2350 | unknown error | Unknown exception, please return to the developer on github. |
| 0x2351 | failed to create subscription | - |
| 0x2352 | Unsupported encoding | An unsupported character encoding set is specified under the native Connection. |
| 0x2353 | internal error of database, please see taoslog for more details | An error occurs when the prepare statement is executed on the native connection. Check the taos log to locate the fault. |
| 0x2354 | JNI connection is NULL | When the command is executed, the native Connection is closed. Check the connection to TDengine. |
| 0x2355 | JNI result set is NULL | The result set is abnormal. Please check the connection status and try again. |
| 0x2356 | invalid num of fields | The meta information of the result set obtained by the native connection does not match. |
| 0x2357 | empty sql string | Fill in the correct SQL for execution. |
| 0x2358 | fetch to the end of resultSet | - |
| 0x2359 | JNI alloc memory failed, please see taoslog for more details | Memory allocation for the native connection failed. Check the taos log to locate the problem. |
| 0x2371 | consumer properties must not be null! | The parameter is empty when you create a subscription. Please fill in the correct parameter. |
| 0x2372 | configs contain empty key, failed to set consumer property | The parameter key contains a null value. Please enter the correct parameter. |
| 0x2373 | failed to set consumer property, | The parameter value contains a null value. Please enter the correct parameter. |
| 0x2374 | consumer config error | - |
| 0x2375 | topic reference has been destroyed | The topic reference is released during the creation of the data subscription. Check the connection to TDengine. |
| 0x2376 | failed to set consumer topic, topic name is empty | During data subscription creation, the subscription topic name is empty. Check that the specified topic name is correct. |
| 0x2377 | consumer reference has been destroyed | The subscription data transfer channel has been closed. Please check the connection to TDengine. |
| 0x2378 | consumer create error | Failed to create a data subscription. Check the taos log according to the error message to locate the fault. |
| - | can't create connection with server within: | Increase the connection time by adding the httpConnectTimeout parameter, or check the connection to the taos adapter. |
| - | failed to complete the task within the specified time : | Increase the execution time by adding the messageWaitTimeout parameter, or check the connection to the taos adapter. |
- [TDengine Java Connector](https://github.com/taosdata/taos-connector-jdbc/blob/main/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java)
<!-- - [TDengine_ERROR_CODE](../error-code) -->
## TDengine DataType vs. Java DataType
TDengine currently supports timestamp, number, character, Boolean type, and the corresponding type conversion with Java is as follows:
......@@ -82,7 +180,7 @@ Add following dependency in the `pom.xml` file of your Maven project:
<dependency>
<groupId>com.taosdata.jdbc</groupId>
<artifactId>taos-jdbcdriver</artifactId>
<version>3.1.0</version>
<version>3.2.1</version>
</dependency>
```
......@@ -97,7 +195,7 @@ cd taos-connector-jdbc
mvn clean install -Dmaven.test.skip=true
```
After you have compiled taos-jdbcdriver, the `taos-jdbcdriver-3.0.*-dist.jar` file is created in the target directory. The compiled JAR file is automatically stored in your local Maven repository.
After you have compiled taos-jdbcdriver, the `taos-jdbcdriver-3.2.*-dist.jar` file is created in the target directory. The compiled JAR file is automatically stored in your local Maven repository.
</TabItem>
</Tabs>
......@@ -333,35 +431,6 @@ while(resultSet.next()){
> The query is consistent with operating a relational database. When using subscripts to get the contents of the returned fields, you have to start from 1. However, we recommend using the field names to get the values of the fields in the result set.
### Handling exceptions
After an error is reported, the error message and error code can be obtained through SQLException.
```java
try (Statement statement = connection.createStatement()) {
// executeQuery
ResultSet resultSet = statement.executeQuery(sql);
// print result
printResult(resultSet);
} catch (SQLException e) {
System.out.println("ERROR Message: " + e.getMessage());
System.out.println("ERROR Code: " + e.getErrorCode());
e.printStackTrace();
}
```
There are four types of error codes that the JDBC connector can report:
- Error code of the JDBC driver itself (error code between 0x2301 and 0x2350),
- Error code of the native connection method (error code between 0x2351 and 0x2360)
- Error code of the consumer method (error code between 0x2371 and 0x2380)
- Error code of other TDengine function modules.
For specific error codes, please refer to.
- [TDengine Java Connector](https://github.com/taosdata/taos-connector-jdbc/blob/main/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java)
<!-- - [TDengine_ERROR_CODE](../error-code) -->
### Writing data via parameter binding
TDengine has significantly improved the bind APIs to support data writing (INSERT) scenarios. Writing data in this way avoids the resource consumption of SQL syntax parsing, resulting in significant write performance improvements in many cases.
......@@ -369,9 +438,11 @@ TDengine has significantly improved the bind APIs to support data writing (INSER
**Note:**
- JDBC REST connections do not currently support bind interface
- The following sample code is based on taos-jdbcdriver-3.1.0
- The following sample code is based on taos-jdbcdriver-3.2.1
- The setString method should be called for binary type data, and the setNString method should be called for nchar type data
- both setString and setNString require the user to declare the width of the corresponding column in the size parameter of the table definition
<Tabs defaultValue="native">
<TabItem value="native" label="native connection">
```java
public class ParameterBindingDemo {
......@@ -599,21 +670,7 @@ public class ParameterBindingDemo {
}
```
The methods to set TAGS values:
```java
public void setTagNull(int index, int type)
public void setTagBoolean(int index, boolean value)
public void setTagInt(int index, int value)
public void setTagByte(int index, byte value)
public void setTagShort(int index, short value)
public void setTagLong(int index, long value)
public void setTagTimestamp(int index, long value)
public void setTagFloat(int index, float value)
public void setTagDouble(int index, double value)
public void setTagString(int index, String value)
public void setTagNString(int index, String value)
```
**Note**: both setString and setNString require the user to declare the width of the corresponding column in the size parameter of the table definition
The methods to set VALUES columns:
......@@ -630,17 +687,203 @@ public void setString(int columnIndex, ArrayList<String> list, int size) throws
public void setNString(int columnIndex, ArrayList<String> list, int size) throws SQLException
```
</TabItem>
<TabItem value="rest" label="REST connection">
```java
public class ParameterBindingDemo {
private static final String host = "127.0.0.1";
private static final Random random = new Random(System.currentTimeMillis());
private static final int BINARY_COLUMN_SIZE = 30;
private static final String[] schemaList = {
"create table stable1(ts timestamp, f1 tinyint, f2 smallint, f3 int, f4 bigint) tags(t1 tinyint, t2 smallint, t3 int, t4 bigint)",
"create table stable2(ts timestamp, f1 float, f2 double) tags(t1 float, t2 double)",
"create table stable3(ts timestamp, f1 bool) tags(t1 bool)",
"create table stable4(ts timestamp, f1 binary(" + BINARY_COLUMN_SIZE + ")) tags(t1 binary(" + BINARY_COLUMN_SIZE + "))",
"create table stable5(ts timestamp, f1 nchar(" + BINARY_COLUMN_SIZE + ")) tags(t1 nchar(" + BINARY_COLUMN_SIZE + "))"
};
private static final int numOfSubTable = 10, numOfRow = 10;
public static void main(String[] args) throws SQLException {
String jdbcUrl = "jdbc:TAOS-RS://" + host + ":6041/?batchfetch=true";
Connection conn = DriverManager.getConnection(jdbcUrl, "root", "taosdata");
init(conn);
bindInteger(conn);
bindFloat(conn);
bindBoolean(conn);
bindBytes(conn);
bindString(conn);
conn.close();
}
private static void init(Connection conn) throws SQLException {
try (Statement stmt = conn.createStatement()) {
stmt.execute("drop database if exists test_ws_parabind");
stmt.execute("create database if not exists test_ws_parabind");
stmt.execute("use test_ws_parabind");
for (int i = 0; i < schemaList.length; i++) {
stmt.execute(schemaList[i]);
}
}
}
private static void bindInteger(Connection conn) throws SQLException {
String sql = "insert into ? using stable1 tags(?,?,?,?) values(?,?,?,?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t1_" + i);
// set tags
pstmt.setTagByte(1, Byte.parseByte(Integer.toString(random.nextInt(Byte.MAX_VALUE))));
pstmt.setTagShort(2, Short.parseShort(Integer.toString(random.nextInt(Short.MAX_VALUE))));
pstmt.setTagInt(3, random.nextInt(Integer.MAX_VALUE));
pstmt.setTagLong(4, random.nextLong());
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setByte(2, Byte.parseByte(Integer.toString(random.nextInt(Byte.MAX_VALUE))));
pstmt.setShort(3, Short.parseShort(Integer.toString(random.nextInt(Short.MAX_VALUE))));
pstmt.setInt(4, random.nextInt(Integer.MAX_VALUE));
pstmt.setLong(5, random.nextLong());
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindFloat(Connection conn) throws SQLException {
String sql = "insert into ? using stable2 tags(?,?) values(?,?,?)";
try(TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t2_" + i);
// set tags
pstmt.setTagFloat(1, random.nextFloat());
pstmt.setTagDouble(2, random.nextDouble());
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setFloat(2, random.nextFloat());
pstmt.setDouble(3, random.nextDouble());
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindBoolean(Connection conn) throws SQLException {
String sql = "insert into ? using stable3 tags(?) values(?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t3_" + i);
// set tags
pstmt.setTagBoolean(1, random.nextBoolean());
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setBoolean(2, random.nextBoolean());
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindBytes(Connection conn) throws SQLException {
String sql = "insert into ? using stable4 tags(?) values(?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t4_" + i);
// set tags
pstmt.setTagString(1, new String("abc"));
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setString(2, "abc");
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindString(Connection conn) throws SQLException {
String sql = "insert into ? using stable5 tags(?) values(?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t5_" + i);
// set tags
pstmt.setTagNString(1, "California.SanFrancisco");
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(0, new Timestamp(current + j));
pstmt.setNString(1, "California.SanFrancisco");
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
}
```
</TabItem>
</Tabs>
The methods to set TAGS values:
```java
public void setTagNull(int index, int type)
public void setTagBoolean(int index, boolean value)
public void setTagInt(int index, int value)
public void setTagByte(int index, byte value)
public void setTagShort(int index, short value)
public void setTagLong(int index, long value)
public void setTagTimestamp(int index, long value)
public void setTagFloat(int index, float value)
public void setTagDouble(int index, double value)
public void setTagString(int index, String value)
public void setTagNString(int index, String value)
```
### Schemaless Writing
TDengine supports schemaless writing. It is compatible with InfluxDB's Line Protocol, OpenTSDB's telnet line protocol, and OpenTSDB's JSON format protocol. For more information, see [Schemaless Writing](../../schemaless).
Note:
- JDBC REST connections do not currently support schemaless writes
- The following sample code is based on taos-jdbcdriver-3.1.0
<Tabs defaultValue="native">
<TabItem value="native" label="native connection">
```java
public class SchemalessInsertTest {
public class SchemalessJniTest {
private static final String host = "127.0.0.1";
private static final String lineDemo = "st,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000";
private static final String telnetDemo = "stb0_0 1626006833 4 host=host0 interface=eth0";
......@@ -668,6 +911,41 @@ public class SchemalessInsertTest {
}
```
</TabItem>
<TabItem value="rest" label="REST connection">
```java
public class SchemalessWsTest {
private static final String host = "127.0.0.1";
private static final String lineDemo = "st,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000";
private static final String telnetDemo = "stb0_0 1626006833 4 host=host0 interface=eth0";
private static final String jsonDemo = "{\"metric\": \"meter_current\",\"timestamp\": 1626846400,\"value\": 10.3, \"tags\": {\"groupid\": 2, \"location\": \"California.SanFrancisco\", \"id\": \"d1001\"}}";
public static void main(String[] args) throws SQLException {
final String url = "jdbc:TAOS-RS://" + host + ":6041/?user=root&password=taosdata&batchfetch=true";
Connection connection = DriverManager.getConnection(url);
init(connection);
SchemalessWriter writer = new SchemalessWriter(connection, "test_ws_schemaless");
writer.write(lineDemo, SchemalessProtocolType.LINE, SchemalessTimestampType.NANO_SECONDS);
writer.write(telnetDemo, SchemalessProtocolType.TELNET, SchemalessTimestampType.MILLI_SECONDS);
writer.write(jsonDemo, SchemalessProtocolType.JSON, SchemalessTimestampType.SECONDS);
System.exit(0);
}
private static void init(Connection connection) throws SQLException {
try (Statement stmt = connection.createStatement()) {
stmt.executeUpdate("drop database if exists test_ws_schemaless");
stmt.executeUpdate("create database if not exists test_ws_schemaless keep 36500");
stmt.executeUpdate("use test_ws_schemaless");
}
}
}
```
</TabItem>
</Tabs>
### Data Subscription
The TDengine Java Connector supports subscription functionality with the following application API.
......@@ -711,8 +989,9 @@ TaosConsumer consumer = new TaosConsumer<>(config);
```java
while(true) {
ConsumerRecords<ResultBean> records = consumer.poll(Duration.ofMillis(100));
for (ResultBean record : records) {
process(record);
for (ConsumerRecord<ResultBean> record : records) {
ResultBean bean = record.value();
process(bean);
}
}
```
......@@ -765,8 +1044,9 @@ public abstract class ConsumerLoop {
while (!shutdown.get()) {
ConsumerRecords<ResultBean> records = consumer.poll(Duration.ofMillis(100));
for (ResultBean record : records) {
process(record);
for (ConsumerRecord<ResultBean> record : records) {
ResultBean bean = record.value();
process(bean);
}
}
consumer.unsubscribe();
......@@ -841,8 +1121,9 @@ public abstract class ConsumerLoop {
while (!shutdown.get()) {
ConsumerRecords<ResultBean> records = consumer.poll(Duration.ofMillis(100));
for (ResultBean record : records) {
process(record);
for (ConsumerRecord<ResultBean> record : records) {
ResultBean bean = record.value();
process(bean);
}
}
consumer.unsubscribe();
......@@ -968,20 +1249,6 @@ The source code of the sample application is under `TDengine/examples/JDBC`:
[JDBC example](https://github.com/taosdata/TDengine/tree/3.0/examples/JDBC)
## Recent update logs
| taos-jdbcdriver version | major changes |
| :---------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------: |
| 3.1.0 | JDBC REST connection supports subscription over WebSocket |
| 3.0.1 - 3.0.4 | fix the resultSet data is parsed incorrectly sometimes. 3.0.1 is compiled on JDK 11, you are advised to use other version in the JDK 8 environment |
| 3.0.0 | Support for TDengine 3.0 |
| 2.0.42 | fix wasNull interface return value in WebSocket connection |
| 2.0.41 | fix decode method of username and password in REST connection |
| 2.0.39 - 2.0.40 | Add REST connection/request timeout parameters |
| 2.0.38 | JDBC REST connections add bulk pull function |
| 2.0.37 | Support json tags |
| 2.0.36 | Support schemaless writing |
## Frequently Asked Questions
1. Why is there no performance improvement when using Statement's `addBatch()` and `executeBatch()` to perform `batch data writing/update`?
......
docs/examples/java/pom.xml
浏览文件 @ 50a24667
......@@ -22,7 +22,7 @@
<dependency>
<groupId>com.taosdata.jdbc</groupId>
<artifactId>taos-jdbcdriver</artifactId>
<version>3.1.0</version>
<version>3.2.1</version>
</dependency>
<!-- ANCHOR_END: dep-->
<dependency>
......
docs/examples/java/src/main/java/com/taos/example/SubscribeDemo.java
浏览文件 @ 50a24667
package com.taos.example;
import com.taosdata.jdbc.tmq.ConsumerRecord;
import com.taosdata.jdbc.tmq.ConsumerRecords;
import com.taosdata.jdbc.tmq.TMQConstants;
import com.taosdata.jdbc.tmq.TaosConsumer;
......@@ -64,7 +65,8 @@ public class SubscribeDemo {
consumer.subscribe(Collections.singletonList(TOPIC));
while (!shutdown.get()) {
ConsumerRecords<Meters> meters = consumer.poll(Duration.ofMillis(100));
for (Meters meter : meters) {
for (ConsumerRecord<Meters> recode : meters) {
Meters meter = recode.value();
System.out.println(meter);
}
}
......
docs/zh/08-connector/14-java.mdx
浏览文件 @ 50a24667
......@@ -36,6 +36,104 @@ REST 连接支持所有能运行 Java 的平台。
请参考[版本支持列表](../#版本支持)
## 最近更新记录
| taos-jdbcdriver 版本 | 主要变化 |
| :------------------: | :----------------------------------------------------------------------------------------------------------------------------------------------------: |
| 3.2.1 | 新增功能：WebSocket 连接支持 schemaless 与 prepareStatement 写入。变更：consumer poll 返回结果集为 ConsumerRecord，可通过 value() 获取指定结果集数据。 |
| 3.2.0 | 存在连接问题，不推荐使用 |
| 3.1.0 | WebSocket 连接支持订阅功能 |
| 3.0.1 - 3.0.4 | 修复一些情况下结果集数据解析错误的问题。3.0.1 在 JDK 11 环境编译，JDK 8 环境下建议使用其他版本 |
| 3.0.0 | 支持 TDengine 3.0 |
| 2.0.42 | 修在 WebSocket 连接中 wasNull 接口返回值 |
| 2.0.41 | 修正 REST 连接中用户名和密码转码方式 |
| 2.0.39 - 2.0.40 | 增加 REST 连接/请求 超时设置 |
| 2.0.38 | JDBC REST 连接增加批量拉取功能 |
| 2.0.37 | 增加对 json tag 支持 |
| 2.0.36 | 增加对 schemaless 写入支持 |
**注**：REST 连接中增加 `batchfetch` 参数并设置为 true，将开启 WebSocket 连接。
### 处理异常
在报错后，通过 SQLException 可以获取到错误的信息和错误码：
```java
try (Statement statement = connection.createStatement()) {
// executeQuery
ResultSet resultSet = statement.executeQuery(sql);
// print result
printResult(resultSet);
} catch (SQLException e) {
System.out.println("ERROR Message: " + e.getMessage());
System.out.println("ERROR Code: " + e.getErrorCode());
e.printStackTrace();
}
```
JDBC 连接器可能报错的错误码包括 4 种：
- JDBC driver 本身的报错（错误码在 0x2301 到 0x2350 之间）
- 原生连接方法的报错（错误码在 0x2351 到 0x2360 之间）
- 数据订阅的报错（错误码在 0x2371 到 0x2380 之间）
- TDengine 其他功能模块的报错。
具体的错误码请参考：
| Error Code | Description | Suggested Actions |
| ---------- | --------------------------------------------------------------- | --------------------------------------------------------------------------------------- |
| 0x2301 | connection already closed | 连接已经关闭，检查连接情况，或重新创建连接去执行相关指令。 |
| 0x2302 | this operation is NOT supported currently! | 当前使用接口不支持，可以更换其他连接方式。 |
| 0x2303 | invalid variables | 参数不合法，请检查相应接口规范，调整参数类型及大小。 |
| 0x2304 | statement is closed | statement 已经关闭，请检查 statement 是否关闭后再次使用，或是连接是否正常。 |
| 0x2305 | resultSet is closed | resultSet 结果集已经释放，请检查 resultSet 是否释放后再次使用。 |
| 0x2306 | Batch is empty! | prepareStatement 添加参数后再执行 executeBatch。 |
| 0x2307 | Can not issue data manipulation statements with executeQuery() | 更新操作应该使用 executeUpdate()，而不是 executeQuery()。 |
| 0x2308 | Can not issue SELECT via executeUpdate() | 查询操作应该使用 executeQuery()，而不是 executeUpdate()。 |
| 0x2309 | invalid sql for executeQuery: (?) | - |
| 0x230a | Database not specified or available | - |
| 0x230b | invalid sql for executeUpdate: (?) | - |
| 0x230c | invalid sql for execute: (?) | - |
| 0x230d | parameter index out of range | 参数越界，请检查参数的合理范围。 |
| 0x230e | connection already closed | 连接已经关闭，请检查 Connection 是否关闭后再次使用，或是连接是否正常。 |
| 0x230f | unknown sql type in tdengine | 请检查 TDengine 支持的 Data Type 类型。 |
| 0x2310 | can't register JDBC-JNI driver | 不能注册 JNI 驱动，请检查 url 是否填写正确。 |
| 0x2311 | can't register JDBC-RESTful driver | - |
| 0x2312 | url is not set | 请检查 REST 连接 url 是否填写正确。 |
| 0x2313 | invalid sql | - |
| 0x2314 | numeric value out of range | 请检查获取结果集中数值类型是否使用了正确的接口。 |
| 0x2315 | unknown taos type in tdengine | 在 TDengine 数据类型与 JDBC 数据类型转换时，是否指定了正确的 TDengine 数据类型。 |
| 0x2316 | unknown timestamp precision | - |
| 0x2317 | | REST 连接中使用了错误的请求类型。 |
| 0x2318 | | REST 连接中出现了数据传输异常，请检查网络情况并重试。 |
| 0x2319 | user is required | 创建连接时缺少用户名信息 |
| 0x231a | password is required | 创建连接时缺少密码信息 |
| 0x231b | invalid json format | - |
| 0x231c | httpEntity is null, sql: | REST 连接中执行出现异常 |
| 0x2350 | unknown error | 未知异常，请在 github 返回给开发人员。 |
| 0x2351 | failed to create subscription | - |
| 0x2352 | Unsupported encoding | 本地连接下指定了不支持的字符编码集 |
| 0x2353 | internal error of database, please see taoslog for more details | 本地连接执行 prepareStatement 时出现错误，请检查 taos log 进行问题定位。 |
| 0x2354 | JNI connection is NULL | 本地连接执行命令时，Connection 已经关闭。请检查与 TDengine 的连接情况。 |
| 0x2355 | JNI result set is NULL | 本地连接获取结果集，结果集异常，请检查连接情况，并重试。 |
| 0x2356 | invalid num of fields | 本地连接获取结果集的 meta 信息不匹配。 |
| 0x2357 | empty sql string | 填写正确的 SQL 进行执行。 |
| 0x2358 | fetch to the end of resultSet | - |
| 0x2359 | JNI alloc memory failed, please see taoslog for more details | 本地连接分配内存错误，请检查 taos log 进行问题定位。 |
| 0x2371 | consumer properties must not be null! | 创建订阅时参数为空，请填写正确的参数。 |
| 0x2372 | configs contain empty key, failed to set consumer property | 参数 key 中包含空值，请填写正确的参数。 |
| 0x2373 | failed to set consumer property, | 参数 value 中包含空值，请填写正确的参数。 |
| 0x2374 | consumer config error | - |
| 0x2375 | topic reference has been destroyed | 创建数据订阅过程中，topic 引用被释放。请检查与 TDengine 的连接情况。 |
| 0x2376 | failed to set consumer topic, topic name is empty | 创建数据订阅过程中，订阅 topic 名称为空。请检查指定的 topic 名称是否填写正确。 |
| 0x2377 | consumer reference has been destroyed | 订阅数据传输通道已经关闭，请检查与 TDengine 的连接情况。 |
| 0x2378 | consumer create error | 创建数据订阅失败，请根据错误信息检查 taos log 进行问题定位。 |
| - | can't create connection with server within: | 通过增加参数 httpConnectTimeout 增加连接耗时，或是请检查与 taosAdapter 之间的连接情况。 |
| - | failed to complete the task within the specified time : | 通过增加参数 messageWaitTimeout 增加执行耗时，或是请检查与 taosAdapter 之间的连接情况。 |
- [TDengine Java Connector](https://github.com/taosdata/taos-connector-jdbc/blob/main/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java)
<!-- - [TDengine_ERROR_CODE](../error-code) -->
## TDengine DataType 和 Java DataType
TDengine 目前支持时间戳、数字、字符、布尔类型，与 Java 对应类型转换如下：
......@@ -82,7 +180,7 @@ Maven 项目中，在 pom.xml 中添加以下依赖：
<dependency>
<groupId>com.taosdata.jdbc</groupId>
<artifactId>taos-jdbcdriver</artifactId>
<version>3.1.0</version>
<version>3.2.1</version>
</dependency>
```
......@@ -97,7 +195,7 @@ cd taos-connector-jdbc
mvn clean install -Dmaven.test.skip=true
```
编译后，在 target 目录下会产生 taos-jdbcdriver-3.0.\*-dist.jar 的 jar 包，并自动将编译的 jar 文件放在本地的 Maven 仓库中。
编译后，在 target 目录下会产生 taos-jdbcdriver-3.2.\*-dist.jar 的 jar 包，并自动将编译的 jar 文件放在本地的 Maven 仓库中。
</TabItem>
</Tabs>
......@@ -336,35 +434,6 @@ while(resultSet.next()){
> 查询和操作关系型数据库一致，使用下标获取返回字段内容时从 1 开始，建议使用字段名称获取。
### 处理异常
在报错后，通过 SQLException 可以获取到错误的信息和错误码：
```java
try (Statement statement = connection.createStatement()) {
// executeQuery
ResultSet resultSet = statement.executeQuery(sql);
// print result
printResult(resultSet);
} catch (SQLException e) {
System.out.println("ERROR Message: " + e.getMessage());
System.out.println("ERROR Code: " + e.getErrorCode());
e.printStackTrace();
}
```
JDBC 连接器可能报错的错误码包括 4 种：
- JDBC driver 本身的报错（错误码在 0x2301 到 0x2350 之间）
- 原生连接方法的报错（错误码在 0x2351 到 0x2360 之间）
- 数据订阅的报错（错误码在 0x2371 到 0x2380 之间）
- TDengine 其他功能模块的报错。
具体的错误码请参考：
- [TDengine Java Connector](https://github.com/taosdata/taos-connector-jdbc/blob/main/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java)
<!-- - [TDengine_ERROR_CODE](../error-code) -->
### 通过参数绑定写入数据
TDengine 的 JDBC 原生连接实现大幅改进了参数绑定方式对数据写入（INSERT）场景的支持。采用这种方式写入数据时，能避免 SQL 语法解析的资源消耗，从而在很多情况下显著提升写入性能。
......@@ -372,9 +441,11 @@ TDengine 的 JDBC 原生连接实现大幅改进了参数绑定方式对数据
**注意**：
- JDBC REST 连接目前不支持参数绑定
- 以下示例代码基于 taos-jdbcdriver-3.1.0
- 以下示例代码基于 taos-jdbcdriver-3.2.1
- binary 类型数据需要调用 setString 方法，nchar 类型数据需要调用 setNString 方法
- setString 和 setNString 都要求用户在 size 参数里声明表定义中对应列的列宽
<Tabs defaultValue="native">
<TabItem value="native" label="原生连接">
```java
public class ParameterBindingDemo {
......@@ -602,21 +673,7 @@ public class ParameterBindingDemo {
}
```
用于设定 TAGS 取值的方法总共有：
```java
public void setTagNull(int index, int type)
public void setTagBoolean(int index, boolean value)
public void setTagInt(int index, int value)
public void setTagByte(int index, byte value)
public void setTagShort(int index, short value)
public void setTagLong(int index, long value)
public void setTagTimestamp(int index, long value)
public void setTagFloat(int index, float value)
public void setTagDouble(int index, double value)
public void setTagString(int index, String value)
public void setTagNString(int index, String value)
```
**注**：setString 和 setNString 都要求用户在 size 参数里声明表定义中对应列的列宽
用于设定 VALUES 数据列的取值的方法总共有：
......@@ -633,17 +690,202 @@ public void setString(int columnIndex, ArrayList<String> list, int size) throws
public void setNString(int columnIndex, ArrayList<String> list, int size) throws SQLException
```
</TabItem>
<TabItem value="rest" label="WebSocket 连接">
```java
public class ParameterBindingDemo {
private static final String host = "127.0.0.1";
private static final Random random = new Random(System.currentTimeMillis());
private static final int BINARY_COLUMN_SIZE = 30;
private static final String[] schemaList = {
"create table stable1(ts timestamp, f1 tinyint, f2 smallint, f3 int, f4 bigint) tags(t1 tinyint, t2 smallint, t3 int, t4 bigint)",
"create table stable2(ts timestamp, f1 float, f2 double) tags(t1 float, t2 double)",
"create table stable3(ts timestamp, f1 bool) tags(t1 bool)",
"create table stable4(ts timestamp, f1 binary(" + BINARY_COLUMN_SIZE + ")) tags(t1 binary(" + BINARY_COLUMN_SIZE + "))",
"create table stable5(ts timestamp, f1 nchar(" + BINARY_COLUMN_SIZE + ")) tags(t1 nchar(" + BINARY_COLUMN_SIZE + "))"
};
private static final int numOfSubTable = 10, numOfRow = 10;
public static void main(String[] args) throws SQLException {
String jdbcUrl = "jdbc:TAOS-RS://" + host + ":6041/?batchfetch=true";
Connection conn = DriverManager.getConnection(jdbcUrl, "root", "taosdata");
init(conn);
bindInteger(conn);
bindFloat(conn);
bindBoolean(conn);
bindBytes(conn);
bindString(conn);
conn.close();
}
private static void init(Connection conn) throws SQLException {
try (Statement stmt = conn.createStatement()) {
stmt.execute("drop database if exists test_ws_parabind");
stmt.execute("create database if not exists test_ws_parabind");
stmt.execute("use test_ws_parabind");
for (int i = 0; i < schemaList.length; i++) {
stmt.execute(schemaList[i]);
}
}
}
private static void bindInteger(Connection conn) throws SQLException {
String sql = "insert into ? using stable1 tags(?,?,?,?) values(?,?,?,?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t1_" + i);
// set tags
pstmt.setTagByte(1, Byte.parseByte(Integer.toString(random.nextInt(Byte.MAX_VALUE))));
pstmt.setTagShort(2, Short.parseShort(Integer.toString(random.nextInt(Short.MAX_VALUE))));
pstmt.setTagInt(3, random.nextInt(Integer.MAX_VALUE));
pstmt.setTagLong(4, random.nextLong());
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setByte(2, Byte.parseByte(Integer.toString(random.nextInt(Byte.MAX_VALUE))));
pstmt.setShort(3, Short.parseShort(Integer.toString(random.nextInt(Short.MAX_VALUE))));
pstmt.setInt(4, random.nextInt(Integer.MAX_VALUE));
pstmt.setLong(5, random.nextLong());
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindFloat(Connection conn) throws SQLException {
String sql = "insert into ? using stable2 tags(?,?) values(?,?,?)";
try(TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t2_" + i);
// set tags
pstmt.setTagFloat(1, random.nextFloat());
pstmt.setTagDouble(2, random.nextDouble());
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setFloat(2, random.nextFloat());
pstmt.setDouble(3, random.nextDouble());
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindBoolean(Connection conn) throws SQLException {
String sql = "insert into ? using stable3 tags(?) values(?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t3_" + i);
// set tags
pstmt.setTagBoolean(1, random.nextBoolean());
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setBoolean(2, random.nextBoolean());
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindBytes(Connection conn) throws SQLException {
String sql = "insert into ? using stable4 tags(?) values(?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t4_" + i);
// set tags
pstmt.setTagString(1, new String("abc"));
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(1, new Timestamp(current + j));
pstmt.setString(2, "abc");
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
private static void bindString(Connection conn) throws SQLException {
String sql = "insert into ? using stable5 tags(?) values(?,?)";
try (TSWSPreparedStatement pstmt = conn.prepareStatement(sql).unwrap(TSWSPreparedStatement.class)) {
for (int i = 1; i <= numOfSubTable; i++) {
// set table name
pstmt.setTableName("t5_" + i);
// set tags
pstmt.setTagNString(1, "California.SanFrancisco");
// set columns
long current = System.currentTimeMillis();
for (int j = 0; j < numOfRow; j++) {
pstmt.setTimestamp(0, new Timestamp(current + j));
pstmt.setNString(1, "California.SanFrancisco");
pstmt.addBatch();
}
pstmt.executeBatch();
}
}
}
}
```
</TabItem>
</Tabs>
用于设定 TAGS 取值的方法总共有：
````java
public void setTagNull(int index, int type)
public void setTagBoolean(int index, boolean value)
public void setTagInt(int index, int value)
public void setTagByte(int index, byte value)
public void setTagShort(int index, short value)
public void setTagLong(int index, long value)
public void setTagTimestamp(int index, long value)
public void setTagFloat(int index, float value)
public void setTagDouble(int index, double value)
public void setTagString(int index, String value)
public void setTagNString(int index, String value)
### 无模式写入
TDengine 支持无模式写入功能。无模式写入兼容 InfluxDB 的 行协议（Line Protocol）、OpenTSDB 的 telnet 行协议和 OpenTSDB 的 JSON 格式协议。详情请参见[无模式写入](../../reference/schemaless/)。
**注意**：
- JDBC REST 连接目前不支持无模式写入
- 以下示例代码基于 taos-jdbcdriver-3.1.0
<Tabs defaultValue="native">
<TabItem value="native" label="原生连接">
```java
public class SchemalessInsertTest {
public class SchemalessJniTest {
private static final String host = "127.0.0.1";
private static final String lineDemo = "st,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000";
private static final String telnetDemo = "stb0_0 1626006833 4 host=host0 interface=eth0";
......@@ -669,8 +911,43 @@ public class SchemalessInsertTest {
}
}
}
````
</TabItem>
<TabItem value="ws" label="WebSocket 连接">
```java
public class SchemalessWsTest {
private static final String host = "127.0.0.1";
private static final String lineDemo = "st,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000";
private static final String telnetDemo = "stb0_0 1626006833 4 host=host0 interface=eth0";
private static final String jsonDemo = "{\"metric\": \"meter_current\",\"timestamp\": 1626846400,\"value\": 10.3, \"tags\": {\"groupid\": 2, \"location\": \"California.SanFrancisco\", \"id\": \"d1001\"}}";
public static void main(String[] args) throws SQLException {
final String url = "jdbc:TAOS-RS://" + host + ":6041/?user=root&password=taosdata&batchfetch=true";
Connection connection = DriverManager.getConnection(url);
init(connection);
SchemalessWriter writer = new SchemalessWriter(connection, "test_ws_schemaless");
writer.write(lineDemo, SchemalessProtocolType.LINE, SchemalessTimestampType.NANO_SECONDS);
writer.write(telnetDemo, SchemalessProtocolType.TELNET, SchemalessTimestampType.MILLI_SECONDS);
writer.write(jsonDemo, SchemalessProtocolType.JSON, SchemalessTimestampType.SECONDS);
System.exit(0);
}
private static void init(Connection connection) throws SQLException {
try (Statement stmt = connection.createStatement()) {
stmt.executeUpdate("drop database if exists test_ws_schemaless");
stmt.executeUpdate("create database if not exists test_ws_schemaless keep 36500");
stmt.executeUpdate("use test_ws_schemaless");
}
}
}
```
</TabItem>
</Tabs>
### 数据订阅
TDengine Java 连接器支持订阅功能，应用 API 如下：
......@@ -714,8 +991,9 @@ TaosConsumer consumer = new TaosConsumer<>(config);
```java
while(true) {
ConsumerRecords<ResultBean> records = consumer.poll(Duration.ofMillis(100));
for (ResultBean record : records) {
process(record);
for (ConsumerRecord<ResultBean> record : records) {
ResultBean bean = record.value();
process(bean);
}
}
```
......@@ -766,8 +1044,9 @@ public abstract class ConsumerLoop {
while (!shutdown.get()) {
ConsumerRecords<ResultBean> records = consumer.poll(Duration.ofMillis(100));
for (ResultBean record : records) {
process(record);
for (ConsumerRecord<ResultBean> record : records) {
ResultBean bean = record.value();
process(bean);
}
}
consumer.unsubscribe();
......@@ -844,8 +1123,9 @@ public abstract class ConsumerLoop {
while (!shutdown.get()) {
ConsumerRecords<ResultBean> records = consumer.poll(Duration.ofMillis(100));
for (ResultBean record : records) {
process(record);
for (ConsumerRecord<ResultBean> record : records) {
ResultBean bean = record.value();
process(bean);
}
}
consumer.unsubscribe();
......@@ -971,20 +1251,6 @@ public static void main(String[] args) throws Exception {
请参考：[JDBC example](https://github.com/taosdata/TDengine/tree/3.0/examples/JDBC)
## 最近更新记录
| taos-jdbcdriver 版本 | 主要变化 |
| :------------------: | :--------------------------------------------------------------------------------------------: |
| 3.1.0 | WebSocket 连接支持订阅功能 |
| 3.0.1 - 3.0.4 | 修复一些情况下结果集数据解析错误的问题。3.0.1 在 JDK 11 环境编译，JDK 8 环境下建议使用其他版本 |
| 3.0.0 | 支持 TDengine 3.0 |
| 2.0.42 | 修在 WebSocket 连接中 wasNull 接口返回值 |
| 2.0.41 | 修正 REST 连接中用户名和密码转码方式 |
| 2.0.39 - 2.0.40 | 增加 REST 连接/请求 超时设置 |
| 2.0.38 | JDBC REST 连接增加批量拉取功能 |
| 2.0.37 | 增加对 json tag 支持 |
| 2.0.36 | 增加对 schemaless 写入支持 |
## 常见问题
1. 使用 Statement 的 `addBatch()` 和 `executeBatch()` 来执行“批量写入/更新”，为什么没有带来性能上的提升？
......
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